They seem to have no affiliation available on their site they probably expect you to drive traffic to them for free.
Long term they will realize that paying 5% to someone for traffic and transaction is cheaper than advertising campaigns that are not bringing in direct results.

"Readers voted a total of 1,249,425 times, and the favorite was clear. Julian Assange raked in 382,020 votes, giving him an easy first place. He was 148,383 votes over the silver medalist, Recep Tayyip Erdogan, Prime Minister of Turkey."
this is from the time poll before they handed it out...
http://newsfeed.time.com/2010/12/13/julian-assange-readers-choice-for-times-person-of-the-year-2010/

Groupon is on the second trajectory post 45degree ramp up. They will either start slowing in growth & adoption, or attempt to add other verticals on top of this one. My guess is other verticals with something that would be similar to a club like Gilt Group where they simply agglomerate their mail book of clients into a participatory club. The most logical next step.

Feminism being irrational is nothing new in conveying an agenda of you are all bad and we are all good is foolish. The allegations were a joke and bring light on an issue that was buried that needed the disinfectant of truth. feminists didn't like truth so they whine.

when all you see is a way to cut expenses, the revenue growth evaporates. Not that there was any creative way of going about creating value in the company to begin with. But it seems they are learning an old motif, when all you have is a hammer (really dumb executie in charge) all problems become nails.